shaunm - 6:58 am on Feb 8, 2013 (gmt 0)
Thanks for answering!
You see when I do a search on Google for the term 'hreflang="cn" it returns many results(including this post)
I went further and picked Google's own URL where they have used this language code.
Check the source of this page :http://support.google.com/chrome/?hl=en#topic=14680